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A kind of preparation method of rare earth tantalate or niobate thermal barrier coating

A thermal barrier coating, tantalate technology, applied in coating, metal material coating process, melt spraying and other directions, can solve the problems of low thermal expansion coefficient, low operating temperature of 6-8YSZ, and high thermal conductivity. Low thermal conductivity, weak interface effect, satisfying diffusion effect

Active Publication Date: 2021-10-26
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the widely used thermal barrier coating materials are mainly 6%-8% yttria-stabilized zirconia (6-8YSZ) and lanthanum zirconate (La 2 Zr 2 o 7 ), both of these two ceramics have a certain degree of deficiency: the use temperature of 6-8YSZ is low (≤1200 ℃), and the thermal conductivity is also high (about 2.5W·m -1 k -1 , 900℃), La 2 Zr 2 o 7 However, there is a problem of low thermal expansion coefficient. With the future development needs of high thrust-to-weight ratio and high outlet temperature of engines and gas turbines, it is imminent to find new thermal barrier coating materials

Method used

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  • A kind of preparation method of rare earth tantalate or niobate thermal barrier coating
  • A kind of preparation method of rare earth tantalate or niobate thermal barrier coating
  • A kind of preparation method of rare earth tantalate or niobate thermal barrier coating

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Effect test

Embodiment 1

[0030] Preparation method of rare earth tantalate or niobate powder to prepare YNbO 4 As an example, the following steps are included:

[0031] Step 1: Follow YNbO 4 The structural formula of Y 2 o 3 Dissolve in concentrated nitric acid to react, and adjust the pH to about 1, then the prepared NbOCl 3 Add the solution drop by drop (dropping speed is 200mL / min), keep stirring, add ammonia water at the same time to stabilize the pH of the system at 9-10, stir for 1 hour, continue stirring for 120min in a 60°C water bath environment, and then use deionized water The precipitate was continuously washed until pH = 7, and the obtained filter cake was dried in an oven at 120°C for 5 hours, then passed through a 500-mesh sieve and sintered at 900°C for 5 hours, and the sintered powder was passed through a 500-mesh sieve again for use.

[0032] Step 2: Mix the powder prepared in step 1 with 30wt.% water by mass to obtain slurry A, and mix slurry A with powder mass fraction of 0.5% ...

Embodiment 2

[0039] The difference with Example 1 is that, as shown in Table 2, the number of gradient layers n=11, the thickness of the rare earth niobate coating is 200 μm, and YNbO in each gradient layer 4 and EuNbO 4 The volume fraction of the powder is shown in Table 2 below.

[0040] Table 2 is YNbO in each gradient layer of embodiment 2 4 and EuNbO 4 Powder Volume Fraction Table

[0041]

[0042]

Embodiment 3

[0044] The difference with Example 1 is that, as shown in Table 3, the number of gradient layers of the ceramic coating n=21, the thickness of the rare earth niobate coating is 300 μm, and YNbO in each gradient layer 4 and EuNbO 4 The volume fraction of the powder is shown in Table 3 below.

[0045] Table 3 is YNbO in each gradient layer of embodiment 3 4 and EuNbO 4 Powder Volume Fraction Table

[0046]

[0047]

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Abstract

The invention relates to the technical field of thermal barrier coatings, and specifically discloses a method for preparing a rare earth tantalate or niobate thermal barrier coating, comprising the following steps: taking two or more different rare earth tantalates (RETaO 4 ) or niobate (RENbO 4 ) ceramic powder is mixed into n parts of mixed ceramic powder, and the volume fraction of at least one rare earth tantalate or niobate ceramic component in the n parts of mixed ceramic powder is continuously increasing or decreasing; the n parts of mixed The ceramic powder is sequentially deposited on the base material to obtain a multi-element gradient rare earth tantalate or niobate thermal barrier coating. The solution of this patent can not only ensure that the thermal barrier coating has the original rare earth niobium / tantalate ceramic (RENb / TaO 4 ) The high expansion coefficient of ceramics, and its thermal conductivity has also dropped significantly, and the thermal conductivity has not exceeded 1.20W·m through experimental testing ‑1 ·K ‑1 , to meet the needs of thermal barrier coatings for low thermal conductivity.

Description

technical field [0001] The invention relates to the technical field of thermal barrier coatings, in particular to a preparation method of rare earth tantalate or niobate thermal barrier coatings. Background technique [0002] Thermal barrier coatings use the heat insulation and corrosion resistance characteristics of ceramics to protect the base material, and have important application values ​​in aviation, aerospace, ships, weapons, etc. At present, the widely used thermal barrier coating materials are mainly 6%-8% yttria-stabilized zirconia (6-8YSZ) and lanthanum zirconate (La 2 Zr 2 o 7 ), both of these two ceramics have a certain degree of deficiency: 6-8YSZ has a lower operating temperature (≤1200°C), and a higher thermal conductivity (about 2.5W·m -1 k -1 , 900℃), La 2 Zr 2 o 7 However, there is a problem of low thermal expansion coefficient. With the future development needs of high thrust-to-weight ratio and high outlet temperature of engines and gas turbines,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/04C04B35/66C04B35/495C04B35/622
CPCC04B35/495C04B35/62222C04B35/66C04B2235/3224C04B2235/3225C04B2235/3255C04B2235/75
Inventor 冯晶郑奇杨凯龙王一涛汪俊陈琳宋鹏葛振华李振军王峰
Owner KUNMING UNIV OF SCI & TECH
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